The U.S. Department of Agriculture estimates the number of calories needed a day at 1,600 to 2,400 per day for adult women and 2,000 to 3,000 per day for adult men, depending on age and physical activity level. So just how many calories do some of your favorite fast-food items contain? Click ahead to find out.

Calorie information courtesy of FastFoodNutrition.org or the restaurant's website.

Photo: Mark Lennihan, Associated Press

The U.S. Department of Agriculture estimates the number of calories...

SAN ANTONIO - Four of the 11 metro areas with the most dangerous diets in the country are in Texas.

Based on six factors such as income, food availability and education, El Paso, Corpus Christi, McAllen-Edinburg-Mission and Port Arthur-Beaumont have some of the most deadly diets in the country, according to 24/7 Wall Street.

Each of the cities have an obesity rate of more than 29 percent. San Antonio, which did not crack the top 11 cities for most dangerous diets, has an obesity rate of 31.1. By comparison, the McAllen-Edinburg-Mission area has an obesity rate of 38.3 percent, according to Gallup.

Low income is the best predictor for unhealthy eating habits, according to Dan Witters, research director at Gallup.

Access to fresh, healthy and affordable food and education are also factors that determine eating habits, Witters has said.

One thing not mentioned in the study is how tasty yet unhealthy Tex-Mex, which is predominantly served in all of the Texas metro areas on the list.

To see the most unhealthy meals in America, click through the slideshow above.

The New Orleans metro area has the least healthy overall diet among all areas reviewed. Corpus Christi ranked 7th most dangerous, McAllen-Edinburg-Mission weighed in at 9th, Beaumont-Port Arthur fell into place at number eight and El Paso, the most dangerous in Texas, ranked 7th in the country.

The most dangerous diets were based on data from Gallup, the U.S. Census Bureau and the U.S. Department of Agriculture.